kennedy



I. E. KENNEDY.

COMBINATION BALL TUBE MILL.

APPLICATION FILED OCT. I2. I9I7.

Patented Nov. 30, 1920.

3 SHEETS-SHEET I.

' L E. KENNEDY.

` COMBINATION BALL TUBE NULL.

' APPLICATION FILED 0CT.12,1917 4 1 ,360,648. I* Patented Nov. 3 0, 1920.

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I. E. KENNEDY.

COMBINATION BALI. TUBE MILE.

APPLICATION FILED OCT. I2, 191?.

-1,360,648. y Panam. 30,1920. y

3 SHEETS-SHEET 3.

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`UNITED STATES PATENT OFFICE.

JOSEPH E. KENNEDY, or NEW YORK, N. Y.

COMBINATION BALL TUBE-MILL.

Specification of LetterSfPatent. l Patented NOV. 30, 1920.'

Application led October 12, 1917. Serial N0. 196,130.

To all whom it may concer/n.'

Be it known that I, JOSEPH E. KENNEDY, a citizen of the United States, and a resident of the borough of Manhattan, city, county, l

in which a. tube mill is divided into c0111-,

partments by means of a perforated transverse partitionscreen, the partially reduced material passing through the screen from' the primary compartment, in which the coarse material is broken up by large metal balls, to the secondary compartment in which such partially reduced material is ground `ne and iinishedrto the grade de- Heretofore when the partition screen has beenbuilt up of segmental sections the inner ends of the latter have been secured between `clamping plates bolted together, the bolts and nuts being liable to work loose under the jar and strain involved in the use of the mill, thus allowing the segments to be forced out of place and causing serious damage, and this result was practically unavoidable because of the location ofthe bolts andattachments on the inside of the tube where they could not be Vobserved orV attended to. Y

My present invention consists in the construction-of the partition screen herein vdescribed and claimed specifically distinctive features being a broad centralized peripheral bearing for contact with the cylindrical shell, said contactual-bearing extending on one or lboth sides of the central web, and the'securing of the inner ends of the segments to a central coupling plate by means of radial :wedge keys which are automatically. tightened during the operation ofthe mill, all as hereinafter fully set forth.

In the Vaccompanying drawings,

Figure l, is a central longitudinal sectional elevation of the mill parts broken away on either side of the partition screen; Fig. 2, an elevation of the partition screen shown inFig. l, on the side upon .which the coupling plate is positioned; 'l v Y Fig. 3, is a sectionalelevation `taken upon plane of line 3 3, Fig. 2; Y

Fig. 4, is ,an elevation of the face of the partition screen shown in the preceding figures, the central coupling plate being omitted; v

Fig. 5, is an elevation ofthe inner face of the coupling plate shown in Figs. 1, 2, and 3 ;v

Fig. 6, is a side elevation of' a -modified form ofpartition screen;

Fig. l7, is asectional elevation thereof taken upon plane of line 7 7, Fig. 6';

. Fig. 8, is a side elevation of another modified form of partition screen;

Fig 9, a sectional elevation thereof taken upon plane'of line 9 9, Fig. 8;

Y Fig. l0, is an elevationof the'inner faceA of'the coupling plate shown in Figs. 8,

and 9;

Y Fig. l1, isa sectional detail upon an enlarged scale of the coupling shown in Figs. 8, and 9,'and illustrating the essential principle of all the forms shown. f C, is the outermetallic cylindrical casing of the tube mill closed at the feed end by the head C', and at the rdischarge end by the head C2. These heads are formed with hollow trunnions c, c2, adapted to rotate in bearings b', b2, mounted on suitable foundations.

Means for rotating the mill, and for feeding and discharging material, arel shown incidentally, but form no part of the present invention which relates particularly tothe partitionv screen P, which divides the mill into two compartments, into the first of which, R, the raw material is introduced. through the hollow trunnion c', by feed mechanism indicated generally at and by F. In this primary reduction chamber R, the material is subjected to the action of hardened steel crushing balls r, which beat and break the ore Vor other material to be reduced to a size small enough to permit it to pass through the perforations p, in the partition screen P, and into the iinishing'chamber R', where Vit issubjected to the attritive action of flint pebbles or equivalent means of reduction until fine enough in grade to escape through the screens c3, to'and through the hollow journal c2, tothe discharge.

VVThe rpartition screen P, considered as a whole, is of cylindrical `form peripherally, comprised'as it is of a series of sectors p', each having a relatively broad arc rim p2, for Contact ,with the interior surface of the cylindrical shelld C, and each rim being formed with a medial web p3, the edges of which are radial, and the inner ends of which are rigidly secured together by a common central coupling plate P', by means of Wedge keys lo, as hereinafter set forth.

Thus the male tongues or lugs pl, recessed for engagement with the keys is, may be provided either upon the sectors p', asin Figs. l, to 7, inclusive, or 'upon the coupling plate P', as in Figs. S to, ll inclusive, as preferred and with like result,- the sockets p5, for saidV male tongues being formed either-in said coupling plate P', as in the first seven figures referred to, or in the several sectors in thelast four iigures referred to, as case may be. initigs. i, to 1i, inclusive, the tongues pt, are shown as formed in one piece with the sectors p, While in Figs. G and 7, they are shown as separate pieces inserted in said sectors p..

111 either, @ase the keys le an as Courbes pins to positively secure the interlocking of the partes-z'. e., the recessed male tongues p4, Within the mortises or sockets p5@ As shown more particularly in Fig. ll, the keys 7c, are tapering or wedge-shaped, and except at their outer ends, of slightly less area in crossV section thanthe recesses formed for their reception in the central coupling plate,

E, or sectors 10'; Thus the medial portion of each key la, bears against the side Wall of the tongue socket nealSt the front of said tongue p4, While the oppositek side of the key bears againsttheV adjacentparts, as insaid F ig. 11,thu`s binding the inner end of each sector p', rigidly to the central coupling plate P,

The head of each key 7e, protrudes beyond the edges'of the interlocking parts of the coupling means farthest from the center, with relation to which lattei` said keys are all positioned radially. Hence during the rotation of the cylinder, the cascading balls or other crushing ineans,'together with the mass ofmaterial under treatment, are precipitated onto the protuberant ends of the keys k, thereby tending constantly to automatically tighten them in their engagement with the sectors y2", and coupling plate l, counteracting centrifugal force as exerted on said keys, and positively uniting the segments, coupling plate and keys, to all intents and purposes, into practically7 an integral, unitary structure adapted to sustain the severe' stress to which the parts are necessarily subjected under ordinary conditions of use.l

The perforations p, in the sectors ya', are of a size and character adapted to screen the reduced material to the required grade of iineness preparatory to its admission into the nishing'chamber R. In Figs. 2, d, 6, and 8, of the drawings only one" sector in each partition P,- is shown as thus formed with screen openings for simplicity ofillustration, itbeing understood thatl each sector issoforrned. 5

necoae The relatively broad arc rims p2, of the sectors constitute collectively, as before intimated, a'practi'cally continuous cylindrical riin for contact with the inner surface of the cylindrical shell or tube C; and this rim is held rigidly in position in the tube by means of the lining L, thereof,-said lining being formed of segmental arcs of suitable material fitting around the interior surfaceof the shell C, and secured in position by means Well known in the ara-the abut ting of the edges of the lining against the edges of the rim p2, sustaining the partition screen against movement in either direction Within the tube C.

By this construction and arrangement of parts i dispense entirely with the 113% of screw bolts and nuts in so far'as the partition Vscreen is concerned, together Withtheir attendant disadvantages, l also render it possible to shift the partition screen Within the tube when desirable, which may be easily accomplished in a comparatively short time without l detriment to either partition er mill, since it is only necessary to shift the lining and partition in order to vary the relativesif/ies of the compartments.

"What l claim asmy'invention and desire to secure by Letters Patent is,

l. ln a ball tube mill of the character deS- ignated, the combination with the rotatable tube having a sectional lining of a partition screen comprising a series of sectors, an axial coupling plate, interlocking means securing the inner ends of said segments together, eafch sector being formed With arelatively broad peripheralrim extending laterally on both sides of a perforated medial web, the lateral edges of therims contacting directly with the lining of the tube, together with said lining, whereby` said: sectors of the partition are. rigidly held centrally and by the lining against longitudinal movement Within as related to said tube, for the purpose described.

2. in a ball tube mill ofthe characterdes ignated, thecombination, with the rotatable tubel of a partit-ion screen comprisinga series of sectors detachabljyT connectedI by interlocking parts and keys to` a central coupling plate, said coupling plate, interlocking parts and radially positioned keys, each of said: sectors being formed with a relatively broad peripheral rim extending laterally on both sides of a perforated medial Web, the lateral edges of the rims contacting directly with the lining of the tube, together with said lining, Wherebysaid sectors of the partition are rigidly held centrally and bv the lining Aagainst longitudinalV movement Within and as related to saidtube, for the Y purpose described.

3, In a Vball tube mill of the character designated, the combination with the `rotatable tube, of a partition screen consisting cured together by Wedge keys, and said Wedge keys formed with protuberant ends for receiving the impact of `the cascading contents of the tube, for the purpose described.

4. In a ball tube inill of the character designated, the combination with the rota-table tube, of a partition screen consisting of a series of sectors and a central coupling plate, said sectors and said coupling plate being formed with interlocking parts and Wedge keys securing said interlocking parts 15 in coupled relationship, for the purpose described.

JOSEPH E. KENNEDY. 

